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Photoisomerization Behavior of Smectic Liquid Crystalline AZO Polymers

Mina Han, Giancarlo Galli, L. Komitov, Kunihiro Ichimura, Emo Chiellini

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Abstract

We have investigated photoisomerization and photoorientation behavior of a liquid crystalline polymethacrylate bearing p-methoxyazobenzene side groups (C6MeO) and copolymethacrylates with p-alkoxylated azobenzene side chains, (poly(AZO-1) and poly(AZO-2)). Irradiation with linearly polarized visible light generated photoinduced optical anisotropy for all polymers as a result of the reorientation of the azobenzenes toward the direction perpendicular to the electric vector of actinic light. On annealing of the photoirradiated films, the azobenzene chromophores of poly(AZO-1) and poly(AZO-2) showed out-of-plane reorientation, whereas those of C6MeO underwent a marked amplification of in-plane orientation.

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What this paper is about

We have investigated photoisomerization and photoorientation behavior of a liquid crystalline polymethacrylate bearing p-methoxyazobenzene side groups (C6MeO) and copolymethacrylates with p-alkoxylated azobenzene side chains, (poly(AZO-1) and poly(AZO-2)). Irradiation with linearly polarized visible light generated photoinduced optical anisotropy for all polymers as a result of the reorientation of the azobenzenes toward the direction perpendicular to the electric vector of actinic light. On annealing of the photoirradiated films, the azobenzene chromophores of poly(AZO-1) and poly(AZO-2) showed out-of-plane reorientation, whereas those of C6MeO underwent a marked amplification of in-plane orientation.

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Available abstract

We have investigated photoisomerization and photoorientation behavior of a liquid crystalline polymethacrylate bearing p-methoxyazobenzene side groups (C6MeO) and copolymethacrylates with p-alkoxylated azobenzene side chains, (poly(AZO-1) and poly(AZO-2)). Irradiation with linearly polarized visible light generated photoinduced optical anisotropy for all polymers as a result of the reorientation of the azobenzenes toward the direction perpendicular to the electric vector of actinic light. On annealing of the photoirradiated films, the azobenzene chromophores of poly(AZO-1) and poly(AZO-2) showed out-of-plane reorientation, whereas those of C6MeO underwent a marked amplification of in-plane orientation.

Key concepts: Azobenzene, Photoisomerization, Chromophore, Azo compound, Polymer, Side chain, Photochemistry, Materials science

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